In this blog post, we’ll take a detailed look at the scientific principles and structure behind how air conditioners cool indoor spaces, as well as their advantages and limitations.   Recently, due to the effects of climate change, summer heat waves and tropical nights have become increasingly frequent. Consequently, air conditioners have evolved beyond mere convenience appliances to become...

In this blog post, we will examine the controversy surrounding the military service bonus point system, its necessity, and the key issues involved, and reflect on the meaning of true equality.   Controversy Surrounding the Military Service Bonus Point System The South Korean government has repeatedly considered introducing the military service bonus point system or similar compensation...

In this blog post, we’ll examine the validity of the Game Shutdown Policy, focusing on its background, purpose, justification, and effectiveness.   What is the gaming curfew system? Is there anyone who hasn’t heard the word “game”? Today, we are surrounded by a wide variety of entertainment and media, and games have established themselves as a form of cultural content that plays an...

In this blog post, we’ll explore criteria for making wise choices by examining the concept of opportunity cost hidden behind visible profits.   True investing begins only when you understand opportunity cost In a previous post on sunk costs, I explained that what you see isn’t the whole story, and that costs already incurred should not be factored into decision-making. The concept we’ll...

In this blog post, we’ll take a step-by-step look at the structure and fluid dynamics principles that allow blade-less fans to generate a strong breeze, even though they appear to have no external rotating blades.   Why Were Blade-Less Fans Invented? For families with children, traditional fans with blades are always a source of concern. Because there’s a risk that a child might stick their...

In this blog post, we’ll explore why mechanical and aerospace engineering is called the foundation of modern engineering by examining its core principles and various applications.   Since the late 2000s, interdisciplinary and convergent research—which combines multiple fields—has become increasingly important in academic research, and today, this approach has established itself as a standard...

In this blog post, we’ll explore the concepts of scientific design and optimal design as applied in mechanical engineering, as well as the role that optimal design plays in product design.   What Are Scientific Design and Optimal Design? In the past, the importance of product design garnered significant attention due to patent disputes surrounding smartphones. In the lawsuits between Samsung...

In this blog post, we’ll explore the concept, characteristics, limitations, and future direction of evidence-based medicine—an approach that evaluates medical decisions based on scientific evidence.   What Is Evidence-Based Medicine? A patient visited the hospital, distressed by a persistent cough and sleepless nights caused by it. After asking a few questions and conducting a physical...

In this blog post, we’ll examine the principles behind stealth technology applied to modern warships and the various ways it’s implemented, and explore what this technology means for naval power.   The Power of Stealth Demonstrated by Submarines   “We have lost more men than Admiral Nelson lost in all the battles he fought throughout his entire life.” This remark is said to have been...

In this blog post, we’ll explore why transit card readers are equipped with clocks by examining the principles behind electronic clocks and quartz oscillators.   Electronic Clocks and Quartz Oscillators Just a few decades ago, clocks were considered luxury items, but those days are long gone. Every room has at least one wall clock, and clocks are built into computers, smartphones, and...