From Mathematical Ratios to Biophysical Reality: A Personal Learning… (No.1817-2, 10/10/2026)

From Mathematical Ratios to Biophysical Reality: A Personal Learning Experience in Stroke-Warning Research (No.1817-2, 10/10/2026) Gerald C. Hsu EclaireMD Foundation Category: Stroke Warning, Engineering Philosophy 5. Returning to Practical Engineering Judgment My academic background includes mathematics, physics, mechanical engineering, structural mechanics, computer science, artificial intelligence, and business management. I began studying applied mathematics and engineering mechanics in 1964 and continued my education at seven universities, including MIT, UC Berkeley, Columbia University, and the University of Iowa. During my professional career, I worked on ships, missiles, nuclear power plants, aerospace systems, computers, and engineering software for mechanical systems and semiconductor chip design. One lesson repeatedly emerged: A mathematically sophisticated model does not guarantee a safe physical design. An engineer can derive excellent equations describing structural loading, stress distribution, and material behavior. However, actual structures must withstand real operating conditions. Understanding theoretical mechanics does not automatically provide the practical experience required to design a reliable spacecraft. Engineering requires years of study, observation, experimentation, design evaluation, and learning from physical behavior. The same principle applies to my medical research. Mathematics describes physical relationships, but biophysical mechanisms determine whether those relationships are meaningful. During my investigation, I recognized that I was spending too much time examining the changing contribution percentages of glucose and SBP. These calculations were not improving my practical decisions. I already knew that my glucose had increased because of my meals while SBP remained stable. My immediate task was to bring glucose back toward its usual range. I did not need two additional curves to reach that conclusion. ──────── 6. My Practical TSI-4 Operating Range Under my usual physiological conditions, TSI-4 remains in the high 60s to mid-70s. During my first two days in Tokyo, it increased into the high 70s. Although I prefer a lower value, I did not consider this temporary increase alarming because it remained below my personal reference level of 80. This is an operational reference derived from my monitoring experience, not an established medical safety threshold. My preferred daily operating ranges are: • eAG: 90–110 mg/dL • SBP: 90–110 mmHg I do not intend to reduce glucose or blood pressure without limits. Excessively low glucose can cause hypoglycemia, while excessively low blood pressure can produce lightheadedness and increase fall risk. I consider these consequences when evaluating my measurements. My objective is to maintain stable glucose and blood pressure while avoiding excessive fluctuations. I concluded that my existing TSI-4 equation provides sufficient mathematical guidance for my monitoring purposes. Additional contribution-percentage curves are unnecessary unless they improve my practical decisions. ──────── 7. Seventeen Years of Glucose Research Versus My Recent Blood Pressure Research I have studied my glucose behavior for 17 years. Since 2010, I have collected extensive physiological and lifestyle data, including glucose, food intake, exercise, body weight, and other metabolic measurements. Through continuous observation, I have learned how my glucose responds to foods, meal portions, physical activity, and daily routines. My blood pressure research is different. Before my stroke on June 21, 2025, I did not devote the same attention to blood pressure because I did not consider myself to have chronic hypertension. My stroke involved an acute elevation in SBP, reaching 185 mmHg on June 21, 2025. Whether hypertension is chronic or acute, sufficiently elevated blood pressure can impose dangerous mechanical loading on vulnerable cerebral vessels. After my stroke, I intensified blood pressure monitoring. Currently, I collect 96 glucose measurements and nearly 120 blood pressure measurements daily. I now collect more blood pressure data than glucose data. This represents a shift in my research priorities. However, I do not understand my blood pressure behavior as thoroughly as my glucose behavior. Seventeen years of glucose monitoring experience cannot be replaced by several months of intensive blood pressure monitoring.