Vlerick Repository
The Vlerick Repository is a searchable open-access publication database, containing the complete archive of research output written by Vlerick Business School faculty and researchers.
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Item Comparing and extending satisfiability solution methods for the resource-constrained project scheduling problem(Elsevier, 2026)This paper solves the resource-constrained project scheduling problem (RCPSP) with a satisfiability problem (SAT) solver. This paper builds further on various existing SAT models for this well-known project scheduling problem and extends them with two methods to satisfy the resource constraints. Specifically, we use the well-known minimal forbidden sets and compare them with the so-called covers that are traditionally used in SAT implementations. Moreover, we also implement an existing binary decision trees approach under various settings and extend the model with networks with adders, so far never used for solving the RCPSP, to guarantee that resource constraints are satisfied. The algorithms are tested under different settings on a set of 13,413 project instances with diverse network and resource structures, and the experiments demonstrate that a combination of these approaches help in finding better solutions within a reasonable time. Moreover, 393 new lower bounds, 62 new upper bounds, and 290 optimally solved instances (including 18 from the PSPLIB) have been discovered, which, to the best of our knowledge, had not been found before. The strong performance of the new algorithm motivated additional experiments, and the preliminary results suggest several promising directions for future research.Item What drives patient cost variability in psoriasis care: a single centre study(Springer Nature, 2025-10-09)Psoriasis a chronic inflammatory skin disease, poses a substantial economic burden on healthcare systems globally. This study examines psoriasis consultations from the provider’s perspective within a dermatology department, aiming to generate detailed cost data to support value-based care. Specifically, it investigates the drivers of consultation-level cost variability, explores opportunities for efficiency, and also estimates one-year treatment costs to inform the development of bundled payment models. The goal is to highlight the importance of patient cost transparency and improving cost structures in chronic disease settings.MethodsUsing Time-Driven Activity-Based Costing (TD-ABC), treatment costs associated with nurses, doctors, and total visits for 127 patients with mild and moderate forms of psoriasis were measured. Financial data was collected in collaboration with the hospital’s financial department. During consultations, nurses and physicians recorded time and patient-related information. Additional or missing details were retrieved from patient medical files. Descriptive analyses assessed mean costs and variability by patient and disease characteristics. Independent variables: therapy type, patient status (new vs. returning), comorbidities, and treatment changes, were stratified to compare cost differences across groups.ResultsMean consultation costs were €55, with a minimum and maximum of €25 and €110. New patients incurred 40% higher costs than returning ones, mainly due to longer interactions with nurses and physicians. Key cost drivers for a total consultation included patient status, personality traits, nurse experience, and therapy switches. Physician consultations were particularly impacted by treatment changes and patient engagement levels. Annual treatment costs varied substantially by medication type: topical treatments averaged €325 per year, systemic treatments €1,353, and biological therapies €11,920, highlighting the significant impact of medication choice on overall expenses.Conclusions: This study highlighted substantial variability in consultation and yearly treatment costs for psoriasis patients. These findings emphasized the critical need for detailed cost data to optimise departmental workflows, support efficient resource allocation, and inform the design of equitable bundled payment models. Improving cost transparency was shown to strengthen clinical and financial decision-making. Future research was recommended to explore the cost implications of comorbidities and to extend benchmarking efforts across dermatology settings to guide system-wide improvements in care delivery and sustainability.Publication Publication Mind the ESG valuation gap - A chatGPT routine to assess ESG value integration in annual reports(Vlerick Business School, 2025)This white paper exposes the gap between sustainability talk and true value creation. Discover why most disclosures overwhelm rather than inform, and how to fix it. Prof Verousis introduces a ChatGPT-powered tool that scans annual reports for real ESG integration. It tests claims against six value-linked pillars: strategy, risk, opportunity, valuation, governance, and disclosure. The result? A clear, comparable ESG integration score that cuts through greenwash. Use it to benchmark peers, track progress, and pinpoint where value is at risk. It works for investors, analysts, executives, and even companies checking their own narrative. Case studies show the wide gap between leaders and laggards. The tool links ESG to cash flow, capital costs, and growth potential. It’s free, scalable, and ready to deploy. Transform ESG from a checkbox to a valuation driver.Item Understanding Decision‐Making to Tackle Complexity in Open Innovation Labs in Government(Wiley, 2025)This article examines the decision‐making processes in open innovation labs (OI‐labs) in government. Through a qualitative single case study, we explore how the use of causal and effectual reasoning, as dichotomous logics, evolves over time and is manifested in the form of organizational practices to tackle temporal, relational, and cultural complexity. The findings reveal three episodes: the conceptualizing of the lab (predominantly causation), the building of the lab (predominantly effectuation), and the sustaining of the lab (hybrid causation–effectuation). Moreover, shifts in the logic are aimed at addressing different types of complexity, and over time, a hybrid logic emerges.