In this blog post, we’ll examine the components and operating principles of RFID technology, compare it to barcodes, and explore real-world applications and future prospects.   What Is RFID? With the advancement of modern information and communication technology, there has been a growing trend toward controlling and managing physical objects—such as home appliances, books, and clothing in...

In this blog post, we’ll explain the structure and operating principles of a PN junction—as well as some simple applications—in an easy-to-understand way.   Why Should You Learn About PN Junctions? We enjoy the benefits of 21st-century technology, such as smartphones, laptops, and computers. While the semiconductor industry has played a major role behind these dramatic advancements, many...

In this blog post, I’ll summarize my thoughts on the MBC documentary episode on “Tablo” and discuss the positive and negative aspects of online exposés.   Introduction The controversy over “Tablo’s academic credentials” has been a hot topic lately, and I watched the MBC documentary that covered it. I already knew before watching the documentary that “Tablo did indeed graduate from Stanford,”...

In this blog post, I’ll explain how JPEG achieves high compression rates by focusing on four key steps: sampling, DCT, quantization, and Huffman coding.   Why JPEG Is Widely Used JPEG files allow photos to be stored in small file sizes with minimal distortion, making them one of the most widely used photo file formats on the internet. For example, a color image with 800,000 pixels would take...

In this blog post, we’ll examine the principles and applications of GPS technology—which makes our lives more convenient—as well as the issues it raises.   Modern Society and the Everyday Use of GPS In modern society, the convenience of daily life has greatly increased as various cutting-edge technologies—such as cars, cell phones, TVs, computers, and robots—have permeated every aspect of...

In this blog post, we’ll explore the structure of DNA, the process of DNA replication within cells, and the principles and importance of DNA amplification via PCR.   What is DNA? DNA, short for deoxyribonucleic acid, is a type of nucleic acid. Nucleic acids are substances found in large quantities in the cell nucleus and are broadly divided into two types: DNA, which stores and replicates...

In this blog post, I’ll explain the principles behind DNA chips, the manufacturing process, and their real-world applications in an easy-to-understand way.   Background and Basic Concepts of DNA Chips The Human Genome Project, launched in 1990, attracted widespread attention. When the project announced on April 14, 2003—ahead of schedule—that it had sequenced approximately 99% of the entire...

In this blog post, we’ll explore the characteristics and applications of carbon materials used in the environmental field, with a particular focus on activated carbon fibers.   What are activated carbon fibers? Have you ever used charcoal at home to purify the air? Charcoal is made by burning wood; it consists mostly of carbon and has a large surface area due to its numerous pores. The...

In this blog post, we’ll analyze the flow around a spin-free ball and examine why it oscillates up and down from a fluid dynamics perspective.   Spinless Balls and Flow Visualization Whenever Ronaldo’s spinless free kick narrowly clears the defensive wall and finds the back of the net, the goalkeeper’s bewildered expression is often caught on camera. The goalkeeper’s look of frustration...

In this blog post, we’ll examine what inequality means in our society, explore the difference between poverty and inequality, review various measurement methods, and assess the level of inequality in South Korea based on domestic and international statistics. We’ll also summarize various perspectives on inequality.   Poverty and Inequality When discussing inequality, the first thing to keep...