Graduate School of Informatics

Encrypted DNS protocols such as DNS over HTTPS (DoH) protect user privacy, but attackers can use them to hide malicious activity such as data exfiltration and command and control traffic. This thesis proposes an autoencoder based approach that learns only from benign DoH traffic and flags flows with high reconstruction error as anomalies. To enable real-time detection, the model uses sixteen flow features that can be computed while a connection is active, and a Zeek based pipeline extracts them from live traffic. On the BCCC-CIRA-CIC-DoHBrw-2020 dataset, the model detected 99% of malicious flows with an overall accuracy of 0.945.

Date: 13.11.2026 / 11:00 Place: B-116

We introduce a permutation-invariant model that reconstructs a receiver-centred vector floor plan from any 4–16 irregularly positioned, position-tagged single-channel room impulse responses (RIRs). A single checkpoint improves from 86.3% mean intersection over union with four measurements to 96.2% with sixteen measurements, allowing acquisition cost, spatial coverage, and reconstruction accuracy to be traded off at deployment without retraining. Random measurement subset training simultaneously enables variable-cardinality inference and serves as structured measurement dropout regularization. The model returns an ordered vector contour and is evaluated on a 240,000-room general-polygon benchmark spanning 4-8 corners, up to five reflex vertices, and certified first-order-invisible walls.

Date: 15.09.2026 / 10:00 Place: A-212

This thesis investigates whether spatially controlled auditory cues can mitigate spatial disorientation (SD), a vestibular illusion common in flight. Twenty participants underwent Barány-chair yaw rotations while visually blocked, with sound delivered via an eight-speaker ring under congruent, incongruent, static, and silent conditions, using three sound types. Multimodal measures (EOG-derived nystagmus, EEG, fNIRS, eye tracking, ECG, joystick) revealed an asymmetric effect: congruent, rotation-matched audio amplified the vestibular response, especially pseudo-speech, while incongruent and static sounds failed to reduce disorientation below the silent baseline. Rather than countering SD, moving sound intensified it, clarifying which configurations do not work and informing future countermeasure design for pilot training.

Date: 04.09.2026 / 10:00 Place: A-212

This thesis investigates both the structural and mechanistic interpretability of OpenVLA. Structural interpretability is examined through conventional linear probing, which maps the hierarchy of representations, whereas mechanistic interpretability is investigated using a log-probability-based probing framework that analyzes the causal use of information through the early-exit mechanism. Both methods are applied layer by layer using task-specific controlled perturbations. By comparing correlation-based and causality-based analyses, the proposed framework provides a comprehensive understanding of how autoregressive Vision-Language-Action models represent and utilize linguistic and action-related information.

Date: 02.09.2026 / 15:00 Place: B-116

The anatolian leopard is a scarcely studied, possibly extinct population of the leopard subspecies tulliana. In this thesis, we sequence potential big cat genomes from a wide temporal and spatial distribution across Anatolia and obtain three workable quality Panthera pardus genomes. We construct mitochondrial and whole-genome phylogenies of the Anatolian leopard. The study represents the first ever whole-genome study into the Anatolian leopards.

Date: 03.09.2026 / 16:00 Place: A-212