As the scope of the Internet of Things (IoT) expands rapidly, the stability of long-term power supply and the reduction of maintenance costs have become critical challenges. In particular, low-power IoT sensors benefit from minimizing battery replacement cycles or even eliminating batteries altogether, which is advantageous both in operational efficiency and environmental sustainability. The technology that makes this possible is Energy Harvesting . What is Energy Harvesting? Energy harvesting refers to the technology of collecting various forms of micro energy available in the surrounding environment and converting it into electrical energy. By transforming sources like sunlight, heat, vibration, and radio waves into operating power for small electronic devices, it enables long-term operation without an external power supply. Main Energy Sources Suitable for Low-Power IoT Indoor Photovoltaic (PV) Provides stable power of 15–35 μW/cm² in office environments with 200–400...

It’s the height of summer, the sun is blazing, and it’s the perfect season for a cool bite of ice cream. Yet surprisingly, recent statistics reveal that the domestic ice cream market has declined by 35% . What’s behind this unexpected drop? In this post, we’ll explore the complex reasons why ice cream sales have plunged despite scorching heatwaves. 1. Sales Volume Falls, Revenue Barely Holds According to the distribution industry, ice cream sales volume fell by as much as 35% in summer 2024 compared to summer 2023. However, total revenue remained relatively stable thanks to higher product prices. In essence, unit prices rose while purchase frequency dropped, showing a clear shift in consumer behavior. 2. Soaring Ingredient Costs, Especially Coconut Oil One of the main culprits is the skyrocketing cost of raw materials . Key ingredients such as coconut oil, milk, and sugar have seen significant price increases in recent years. Since coconut oil is heavily imported, global ma...

Smart keys have become an essential technology to enhance both the security and convenience of vehicles. However, as technology advances, so do the hacking techniques that exploit it. One of the most notorious methods is the relay attack . In this post, we’ll break down what relay attacks are, real-world cases of theft, and practical ways to protect your car from these sophisticated hacks. What is a Relay Attack? A relay attack involves two or more criminals using a wireless repeater to trick your car into thinking the key is nearby. For example, even if the key is inside your house, one attacker places a repeater near your front door while the other stands near your car. The repeater transmits the signal to the car, which mistakenly assumes the key is within range, allowing unauthorized unlocking or ignition Real-Life Cases of Relay Attacks London, UK: Hundreds of BMWs and Mercedes vehicles were stolen in 2020 using relay attack methods. Munich, Germany: ...

1. The Origin of Korean Chinese Cuisine: Gonghwachun in Incheon The root of Korean Chinese cuisine began in 1905 at Gonghwachun , a Chinese restaurant that opened in Incheon. At the time, Chinese immigrants from Shandong settled in Incheon's Chinatown and recreated dishes from their homeland, which gave birth to jajangmyeon . Over the 20th century, it gradually evolved into a uniquely Korean style . 2. Jajangmyeon, a Flavor Not Found in China The original form of jajangmyeon is “zhajiangmian (炸醬麵)” from the Shandong region of China. This Chinese version is a simple mix of stir-fried meat and soybean paste. Korean-style jajangmyeon uses a sauce made with chunjang (a Korean black bean paste) and caramel to create a sweet, rich black sauce, becoming a popular, affordable meal in Korea. 3. Jjamppong: From Japan to Korea The name “jjamppong” is derived from the Japanese “Champon (ちゃんぽん),” which refers to mixing various ingredients in one bowl. However, in Korea, the dish...

A morning salad is a great way to kickstart a healthy day. Especially when you add plenty of protein , it helps with satiety, energy balance, and muscle maintenance. So what are the best protein ingredients to pair with your salad? Chicken Breast: Always a Winner Sliced or cubed chicken breast is rich in protein and low in saturated fat. It’s one of the most popular options. If you prepare it in advance and store it in the fridge, it’s a breeze to use in the morning. Boiled or Soft-Boiled Eggs Eggs are a complete protein food , offering a well-balanced nutrient profile. Adding one or two to your salad provides creaminess and depth. A soft-boiled egg is especially rich and satisfying. Avocado and Cheese Work Beautifully Together Avocados are rich in healthy fats and fiber, but they also contain a small amount of protein. Combine them with cottage cheese or mozzarella to boost flavor and protein content. Don’t Overlook Plant-Based Proteins For those who prefer lighter...

1. The Evolution of Cooking Appliances — What Should You Choose? One of the biggest dilemmas people face when setting up a new kitchen is choosing between an induction cooktop and a gas stove . Each has its own set of strengths and weaknesses, so rather than asking which is “better,” it’s more practical to consider your environment, energy efficiency, and safety . 2. How Induction Works Induction cooktops use electromagnetic induction to heat cookware directly. A high-frequency alternating current flows through coils under the cooktop, generating a magnetic field. This magnetic field creates eddy currents in the bottom of cookware that contains iron. These currents cause the cookware itself to generate heat . Since the surface of the cooktop doesn’t get hot, the risk of burns is reduced and energy is not wasted . 3. How Gas Stoves Work Gas stoves use city gas or LPG to produce a flame that heats the cookware from below. Because the flame is visible, it allows for intuitiv...

    There’s a tiny component found in almost every electronic device we use every day: the capacitor . It stores and releases electrical energy temporarily, playing a vital role in power management and signal integrity. But where did it come from? Today, we’ll explore the invention and evolution of the capacitor from the 18th century to the present.     1. Birth of the Capacitor: The Discovery of the Leyden Jar In 1745, Pieter van Musschenbroek of Leiden University in the Netherlands accidentally invented a device that could store static electricity: the Leyden jar . Using a glass jar filled with water and coated with metal foil, this setup could hold a significant electric charge—becoming the first known capacitor. 2. The Rise of the “Condenser” and Its Role In the 18th and 19th centuries, the term “ condenser ” was used to describe this device because it “condensed” or collected electric charge. It was widely used in sta...