arXiv subjects

Kiseok Kim

Publications and source records attributed to Kiseok Kim.

3 recordsLinked to original sources

arXiv2026

HALO: Heterogeneous Admission through Localized Obligations for Safe Agentic Execution

Recent agentic AI systems may return a heterogeneous response containing notices, requests, handoffs, and actions. Conditions can change before external use, so components from the same response need not remain supported together. Rejecting the whole response discards useful components, whereas checking components independently can leave a dependent without its prerequisite. We present Heterogeneous Admission with Localized Obligations (HALO), a runtime protocol that preserves supported components whose declared prerequisites also remain supported, rechecks each exact action before dispatch, and allows blocked actions to be replaced only by fresh candidates. HALO matched all 96 admission expectations and passed all 20 protocol tests. In structured-response replay, it retained 248/248 supported components, including 128/128 unaffected by unrelated changes, while a whole-response policy retained 0/248. Across ten cold-start PX4/Gazebo sessions, HALO blocked every tested stale route, observed no matching stale setpoint, and completed all fresh recoveries.

cs.AI↗

arXiv2026

Cross-IP Request Coalescing: Relocating the Fan-out Point in Virtualized I/O

Cloud data centers rely on virtualization technologies to serve AI workloads in multi-tenant environments. With the growing scale of data-intensive AI workloads, the performance of storage I/O paths at the virtualization layer has become a critical factor. A single user request often crosses multiple IP blocks, where functional units such as storage, GPU, and accelerator devices under virtualization fan out into separate stack traversals between the guest and the backend. As a result, round-trip and context-switching overheads accumulate with the number of devices. In this letter, we identify that a dominant factor in this overhead lies not in the kernel-mediated I/O path alone, but in the per-device submission structure itself, which persists even in user-space, kernel-bypass storage frameworks such as SPDK. To address this, we propose cross-IP request coalescing, which relocates the fan-out point from the guest to the SPDK vhost-user backend. The guest submits multi-device I/O as a single compound request, and the accelerated bdev at the backend decomposes and dispatches it to each target device, replacing multiple per-device guest-backend round trips with a single submission. Evaluation in an SPDK-based virtualized environment shows that the proposed approach achieves up to 1.78x lower latency than the per-device baseline, with the benefit growing as concurrency increases.

cs.DC↗

arXiv2019

Pseudogap and weak multifractality in disordered Mott charge-density-wave insulator

The competition, coexistence and cooperation of various orders in low-dimensional materials like spin, charge, topological orders and charge-density-wave has been one of the most intriguing issues in condensed matter physics. In particular, layered transition metal dichalcogenides provide an ideal platform for studying such an interplay with a notable case of 1${T}$-TaS$_{2}$ featuring Mott-insulating ground state, charge-density-wave, spin frustration and emerging superconductivity together. We investigated local electronic states of Se-substituted 1${T}$-TaS$_{2}$ by scanning tunneling microscopy/spectroscopy (STM/STS), where superconductivity emerges from the unique Mott-CDW state. Spatially resolved STS measurements reveal that an apparent V-shape pseudogap forms at the Fermi Level (E$_{F}$), with the origin of the electronic states splitting and transformation from the Mott states, and the CDW gaps are largely preserved. The formation of the pseudogap has little correlation to the variation of local Se concentration, but appears to be a global characteristics. Furthermore, the correlation length of local density of states (LDOS) diverges at the Fermi energy and decays rapidly at high energies. The spatial correlation shows a power-law decay close to the Fermi energy. Our statistics analysis of the LDOS indicates that our system exhibits weak multifractal behavior of the wave functions. These findings strongly support a correlated metallic state induced by disorder in our system, which provides an new insight into the novel mechanism of emerging superconductivity in the two-dimensional correlated electronic systems.

cond-mat.str-el↗