Congratulations to Denys Bondarev on successfully defending his Ph.D. thesis NEWS On May 2, 2024, at the one-time specialized academic council of Igor Sikorsky Kyiv Polytechnic Institute DF 26.002.117, Denys Bondarev defended the dissertation on the topic: “Improving the method of calibrating a biomedical photometer with ellipsoidal reflectors” from the field of knowledge 15 – Automation and Instrumentation in the specialty 152 – Metrology and Information and Measurement Techniques for obtaining the degree of Doctor of Philosophy. We congratulate Denys and his scientific supervisor, Doctor of Technical Sciences, Professor Mykhailo Bezuglyi, on an important event and a positive result! May this success be the stepping stone to a future filled with even more remarkable scientific achievements for you, Denys!