Obuda University

A Controlled Comparison of U-Net Variants for Surgical Instrument Segmentation in Minimally Invasive Surgery

Background: Surgical instrument segmentation is a relevant computer vision task in minimally invasive surgery, where binary masks can be used to separate surgical instruments from the background. This study compares selected U-Net architectural configurations for binary surgical...

On the Turán Number of the G3×3 in Linear Hypergraphs

ABSTRACT We construct dense 3‐uniform linear hypergraphs without grids. This improves the known lower bound for their Turán number. We also discuss some related problems.

Context engineering frames prompt engineering within system level orchestration for large language model applications

Abstract By moving from isolated instruction crafting to system-level contextual orchestration, context engineering reframes how large language model (LLM) applications are designed for complex, multi-source workflows. Prompt engineering can deliver strong results for narrow, sin...

A Two-Stage Self-Aligning, Two-Sided Flat-on-Flat Friction-Measurement Device for Universal Testing Machines Under Elevated Contact Pressures

The precise determination of the coefficient of friction is of fundamental importance in many engineering applications, especially in cases where different material pairs, surface-treated systems, polymers or coated surfaces come into contact with each other. Classical tables of...

Cyber harassment engagement and its impact on academic performance impairment: a theory of planned behavior approach

Abstract Cybercrime is one of the most pressing global challenges in the digital era, encompassing offenses conducted through computer networks and online platforms. Among these, cyber harassment refers to the use of electronic communication, such as email, social media, and mess...

Employee Responses to Crisis-Related Organizational Change: Evidence from Hungarian SMEs

Empirical research on organizational behavior contributes significantly to the examination of workplace impacts and to a deeper understanding of the underlying drivers of employee behavior. The long-term sustainability of organizations operating in VUCA environments depends large...

Beyond Access and Awareness: The Role of Patient Experience and Physician Communication in Cervical Cancer Screening Participation in Hungary

Background/Objectives: To evaluate cervical cancer screening participation among women in Hungary and to identify motivators, barriers, experiences, and social factors associated with screening attendance. Methods: A cross-sectional survey with nationwide recruitment was conducte...

Uniqueness in multivariate curve resolution, re-tuned

There are many misunderstandings about the term and interpretation of uniqueness in multivariate curve resolution tasks. In CAC2026 Tarragona, it turned out that even mathematicians do not properly construe Manne’s theorems. So we decided to provide this re-tuned summary, using s...

Preparation and Characterization of Fenofibric Acid-Loaded Electrospun Fibrous Mats

Fenofibric acid-loaded microfibrous mats were produced by electrospinning using polyvinylpyrrolidone (PVP) as a carrier polymer. Fenofibric acid, obtained through alkaline hydrolysis of fenofibrate, was incorporated into PVP solutions and processed under optimized electrospinning...

Oral health and systemic health outcomes: A call for interdisciplinary action

Abstract Objectives To make the case, from periodontology and dental public health, for interdisciplinary action on oral and systemic health, and to set out recommendations for practice, policy, education, and research. Materials and Methods A joint working group of the European...

Intrinsic volumes of the quantum state space and mutually unbiased bases

Abstract Previous studies on the geometrical properties of the state space of a finite-level quantum system have determined its volume and surface area. Building on this foundation, we derive explicit formulas for two additional intrinsic volume quantities. The question of whethe...

Trust and risk perception shape consumer decisions on the Hungarian pork market during African swine fever

Abstract Disease outbreaks and other disruptions to the food industry test consumer confidence, credibility and decision-making. A hot topic and relevant example of the intersection of behavioral adaptation, risk perception, decision-making and credibility is African Swine Fever....

Performance evaluation of a position-sensitive SiPM-based gamma camera for intraoperative imaging

Abstract Background The POSiCS camera is a handheld and wireless, small field-of-view gamma camera developed for use in radio-guided surgery (RGS), with sentinel lymph node biopsy (SLNB) as its benchmark application. This compact and lightweight detector (about $$350\,\textrm{g}$...

Efficient Feature Selection with Multiple Equivalent Subsets Using a Multi-objective Quantum-inspired Evolutionary Approach

Abstract In many real-world applications, it is useful to identify multiple distinct feature subsets that achieve the same classification accuracy with the same number of features. This gives domain experts more flexibility to choose feature combinations based on cost, availabili...