In this blog post, we’ll examine the evolution of aircraft propulsion technology—from propellers to jet engines and on to ramjet engines—and explore the structure, operating principles, advantages, and limitations of ramjet engines, which utilize the ram effect. The Evolution of Propulsion Technology Toward Faster Flight Ever since the Wright brothers’ first powered flight in 1903—during...
Glasses That Let You See Deep Underground: What Is Geophysical Exploration?
In this blog post, we’ll explore the principles, processes, types, and applications of geophysical exploration—a method for identifying underground geological structures and resources without actually digging into the ground. These days, the term “shale gas” often catches the eye in the news. Shale gas refers to natural gas trapped in the microscopic pores and fractures of shale, a clay...
Geothermal Energy: The Dark Horse Among Underground Energy Sources—Can It Become the Alternative Energy of the Future?
In this blog post, we will examine the characteristics and utilization conditions of geothermal energy—the thermal energy found underground—as well as the principles behind geothermal power generation and geothermal heat pumps, along with the limitations of geothermal energy and the technologies designed to overcome them. The utilization and securing of energy sources are among the...
What is the most basic device for communicating with digital signals?
In this blog post, we’ll explore the structure and operating principles of the 7-segment display—the most basic device that converts digital signals into numbers humans can understand—as well as the 7-segment driver that controls it. Everyone has probably heard at least once that digital signals consist solely of 0s and 1s. However, this concept may not resonate much with the general...
Why Do People Still Use Pencils and Handwriting in the Digital Age?
In this blog post, we’ll explore why people continue to use pencils and pens and seek out handwriting and an analog sensibility, even in an era where digital devices have become part of everyday life. In the 21st century, the world we live in today is one where “typing” characters has become more common than “writing” them by hand. With the rapid advancement and widespread adoption of...
How have advances in digital technology transformed popular music?
In this blog post, we’ll examine how advances in digital technology have changed the way music is produced, distributed, and consumed, and how they’ve impacted the popular music industry. PSY’s “Gangnam Style” is a prime example of global popularity, having surpassed 6 billion views on YouTube as of July 2026 and reaching No. 2 on the Billboard Hot 100. Famous international celebrities...
How are the drone market and its future evolving?
In this blog post, we’ll examine the concept, forms, applications, market growth potential, and safety and security issues surrounding drones, which are increasingly being used in both everyday life and industrial settings. What are drones, and why are they gaining attention? Recently, it’s become common to see coverage of drones, or unmanned aerial vehicles (UAVs), on TV and in numerous...
Why should homosexuality not be subject to discrimination, and how can prejudice against sexual orientation be eliminated?
In this blog post, I’ll examine the social controversies and prejudices surrounding homosexuality and consider why it should not be a target of discrimination or controversy. Why is homosexuality constantly a subject of controversy? In 2015, a kissing scene between female high school students in the South Korean JTBC drama ‘Seonam Girls’ High School Detective Club’ sparked...
Should same-sex marriage be legalized for the sake of individual rights and happiness?
In this blog post, I will examine the reasons why same-sex marriage should be legalized, focusing on the meaning and evolution of marriage, individual rights and the right to pursue happiness, and the social problems that may arise if legalization is restricted. The Changing Meaning of Marriage and Social Perceptions We now live our lives pursuing happiness and asserting our rights. As...
Should we reduce animal testing to advance medical science while protecting animal rights?
In this blog post, I will examine the necessity and limitations of animal testing based on the two values of animal rights and human welfare, and explore alternative methods to reduce animal testing as well as the significance of the 3Rs principle. Can animal testing and animal rights coexist? For a long time, humans have conducted numerous animal experiments to develop new drugs. In 1903...