Research works

Adaptive Portfolio Rebalancing for NASDAQ-100 Stocks with Hippopotamus Optimization Algorithm under Transaction Costs

This study proposes a transaction cost-aware portfolio optimization framework for NASDAQ-100 stocks based on the Hippopotamus Optimization Algorithm (HOA). The mathematical model extends the classical mean-variance framework by incorporating transaction costs into a Net Sharpe Ra...

Macroeconomic Determinants of Investment Credit in Indonesia: Evidence from the ARDL Bounds Testing Approach

Investment credit plays an important role in financing productive activities and sustaining Indonesia's economic development. Nevertheless, limited empirical evidence is available regarding how fluctuations in gold prices together with other macroeconomic indicators influence inv...

Energy, Technology, And The Emerging Geopolitical Order

The international system is undergoing a transformation that extends beyond conventional great-power rivalry. What is changing is not simply the distribution of power among states, but the mechanisms through which power is exercised, sustained, and constrained. Assumptions that s...

Energy, Technology, And The Emerging Geopolitical Order

The international system is undergoing a transformation that extends beyond conventional great-power rivalry. What is changing is not simply the distribution of power among states, but the mechanisms through which power is exercised, sustained, and constrained. Assumptions that s...

Monetary Forest Recreation Values 2023

The files contain the original raw data of a 2023 population survey in Germany that used the contingent valuation method for valuing forest recreation, as well as the corresponding questionnaire. This application of the Contingent Valuation Method aimed at valuing the willingness...

Artificial intelligence and managerial decision-making: a systematic literature review of its implications for strategic management in organizations

Artificial intelligence (AI) has been incorporated into business administration to support managerial decision-making; however, recent literature agrees that its strategic value lies not in full automation, but in augmenting human judgment, which introduces governance and respons...

Artificial intelligence and managerial decision-making: a systematic literature review of its implications for strategic management in organizations

Artificial intelligence (AI) has been incorporated into business administration to support managerial decision-making; however, recent literature agrees that its strategic value lies not in full automation, but in augmenting human judgment, which introduces governance and respons...

Treatment Options for Focal Cartilage Lesions of the Knee.

BACKGROUND: Focal lesions of knee cartilage are a common reason for consulting an orthopedist. They may be painful and impair knee joint function. Cartilage lesions can progress to osteoarthritis of the knee. METHODS: This narrative review is based on pertinent publications of th...

Stab Injuries Due to Violent Crime: An Analysis of Data on Severely Injured Persons From the DGU Trauma Registry, 2013-2024.

BACKGROUND: Recent years have seen an increase in reported violent crime involving knives. Valid case numbers of severe stabbing injuries have not been available to date, and the poor state of the evidence hinders consideration of the matter not only on the medical level, but on...

COVID-19 and the centrality of care: pandemic-induced shifts in the gendered organisation of unpaid domestic and care within heterosexual households in Scotland

This chapter explores how the COVID-19 pandemic reshaped the gendered organisation of unpaid domestic and care work within Scottish households. Drawing on qualitative interviews with 15 heterosexual couples, it investigates how containment measures intensified unpaid care respons...

Zero Divisors as Signposts: A Transport Principle for Clifford Algebras, from Gravitational Singularities to a Candidate Theory of Everything

Division by zero is mathematics' most famous forbidden move. This paper takes the opposite view: in the algebras that most naturally describe spacetime - Clifford algebras - the failure of division is not a defect but a signpost: dividing by zero does not break the mathematics, i...

Belief-MVCC: A Coherence and Transaction Layer for Shared Agent Memory

We present a coherent, transactional, semantic shared-memory kernel through which specialised AI cores read and write while staying consistent. The design combines belief revision (AGM; Darwiche–Pearl; Konieczny–Pino Pérez), distributed-systems consistency (causal+, RedBlue, BSP)...

Modeling the KM3NeT Ultra-High-Energy Neutrino Anomaly (KM3-230213A) via the Optical Opacity and Shielding Hypothesis

On February 13, 2023, the KM3NeT collaboration detected an ultra-high-energy neu-trino event (KM3-230213A) with an estimated energy of Eν ≈ 220 PeV, making it themost energetic astrophysical neutrino ever observed [1]. Despite extensive multi-wavelengthfollow-up campaigns across...

Saturation-Splitting Hypothesis: Integrated-Intelligence Saturation and the Divergence of Local Improvement in Self-Improving AI

Recursive self-improvement is often discussed as though an AI system could increase its intelligence without bound. This paper applies the author's previously proposed AI Saturation-Splitting Hypothesis to the narrower case of single-agent self-improvement. The hypothesis propose...

Seed variability and calibrated error bounds for physics-informed conjugate heat transfer surrogates

Physics-informed neural networks are often proposed as fast surrogates for heat transfer problems too expensive to solve inside a design or control loop. Two questionsabout them are rarely answered: how much of the reported accuracy survives a change of random seed, and how large...

Foundation I: The Metric Universe - Extended Version

We investigate a minimal cosmological extension of General Relativity based on the Einstein-Cartan-Kibble-Sciama (ECKS) framework. A primordial spin component — with stiff equation of state w=1, geometrically distinct from scalar kination — induces a transient phase reducing the...

Solvency Field Theory (SFT) V13.11: An Information-Theoretic Foundation for Cosmology and Gravity

Solvency Field Theory (SFT): The V13 Framework Overview A particle is real energy moving at c, either open as light or closed into a self-maintaining orbit as mass, leaving permanent settlement history as it writes. Gravity is what that settlement looks like from the outside. Exp...

Data-driven Reverse Engineering of Physical Laws: Extracting Unknown Interactions via Hierarchical Basis Expansion

This record contains a private research note summarizing the Operator Basis Architecture (OBA), a data‑driven inverse‑problem framework for extracting unknown physical interactions from stationary distributions. The content is shared on Zenodo for archival and version‑tracking pu...

The Theory of Data: An Introduction — Analytical Meaning, Lawful Transformation, and Governed Results

The Theory of Data: An Introduction presents an accessible introduction to the Theory of Data for analysts, data engineers, analytics engineers, semantic-layer developers, and AI engineers. The Theory begins from a distinction that analytical systems often leave implicit: produci...

Orbital Model Theory of Primordial Particles

# Derivation of Core Standard‑Model Structure from Nine Axioms This paper derives the core structure of the Standard Model of particle physics starting from nine axioms. The axioms postulate a fundamental entity—the primordial particle—that undergoes isotropic closed‑orbit motion...