South 중학교 2학년 Technology and Home Economics

Chapters: 4

1. Human development and self-directed life

Self-esteem and identity · Food and clothing for growing teens · Nutrition in adolescence · Clothing design and self-image · Handling stress, anger, low mood · Teen addictions · Lifelong career design · Sexual self-determination · Healthy peer relationships · Diverse modern families · Resolving relationship conflicts · Preventing sexual and domestic violence

Self-Identity: Who Am I, and How Do I Live It? – Identity is your sense of who you are: your roles, values, strengths and dreams. We know ourselves through reflection. Self-esteem is how much we value ourselves. A strong moral identity means our actions match our values.
Nutrition – Nutrition is how we get and use the substances in food. The body needs six groups of nutrients: carbohydrates and fats (mainly energy), proteins (growth and repair), vitamins and minerals (small amounts to keep the body working), and water, plus fibre for healthy digestion. Carbohydrate and protein give about 17 kJ per gram, fat about 37 kJ per gram. A balanced diet gives all nutrients in the right amounts, and energy in should roughly equal energy out.
Clothing: Why We Wear It, What It Is Made Of and How to Choose It – Clothes protect us from sun, rain and cold, give modesty, show identity (uniforms, traditional dress such as the sari or hanbok) and let us express ourselves. They are made of fibres: natural ones from plants (cotton, linen) and animals (wool, silk), and synthetic ones from petroleum (polyester, nylon). Fibres are spun into yarn and made into fabric by weaving (over-under) or knitting (loops). Design uses line, colour, shape and texture. A smart buyer plans a wardrobe, checks fit, quality and the care label, compares shops, works out cost per wear, and chooses sustainable options: buy less, mend, swap and recycle.
Mental Health: Feelings, Stress and Support – Mental health is how we think, feel, cope and get along with others. Like physical health, everyone has it and it moves up and down. Emotions are useful signals. Stress adds up like water in a bucket; healthy coping (sleep, movement, talking, calm breathing, planning) lets it drain. Self-esteem and good relationships protect us. If feelings stay very heavy for two weeks or more, or stop daily life, talk to a trusted adult or a professional — asking for help is a sign of strength.
Addiction: How It Starts and How to Stay Free – Addiction is losing control over a substance or a behaviour, even when it causes harm. It can be to substances (tobacco, alcohol, drugs, misused medicines) or to behaviours (gaming, gambling, social media). Each use gives the brain a burst of dopamine, which teaches it to repeat the action; with time tolerance grows and you need more. Warning signs are craving, loss of control, compulsion and carrying on despite harm. Protection comes from refusal skills, healthy rewards, sleep and routine, and asking for help early. Addiction is treatable.
Career Planning: From Knowing Yourself to Your First Job – Career planning has five steps. 1) Know yourself: interests, skills and values. 2) Explore career families and find out the work, study needed, pay and demand. 3) Plan a pathway with SMART goals and a plan B. 4) Search for jobs with a CV, cover letter, digital portfolio and interview practice. 5) Make the move from school to work and keep learning, because careers change over a lifetime.
Respect, Consent and Gender Equality: Sexual Ethics for Teens – Sexual ethics means treating your own body and other people with respect. Consent must be clear, free, informed and can change at any time. Pressure, fear or power make a "yes" invalid. Everyone has equal rights whatever their gender, and anyone can ask a trusted adult for help.
Family Ethics: Living Well Together as a Family – A family is a group of people who live with, care for and depend on each other. Families come in many shapes: nuclear, joint, single-parent, blended, couples, grandparent-led. Family ethics means the fair and kind ways members treat each other: equal respect, shared work, honest talk, and care for children and elders. A healthy couple relationship rests on free choice, trust and equality. Every family meets problems; good talk, fair sharing and outside help get it through.
Safety Education: Staying Safe at Home, on the Road and with People – Safety means spotting hazards early and acting before harm happens. Risk = likelihood × harm. Keep exits clear and use stairs in a fire, follow traffic rules and wear a helmet or seat belt, wash hands and use medicine correctly, and in any unsafe situation with a person: say NO, GO away and TELL a trusted adult.

2. Living environment and sustainable choices

Life resources and their cycle · Balanced meals using Korean dietary guides · Choosing and storing food safely · Planning and cooking sustainable meals · Clothing materials and care · Sustainable clothing plans · Changing meaning of housing · Healthy living environments · Organising living space · Production and disposal of goods · Changing consumer environment · Teen consumer decisions · Consumer rights and responsibilities · Digital living and its changes

Sustainability – Sustainability means meeting our needs today without taking away the ability of future people to meet theirs. It rests on three pillars — environment, society and economy. A resource is used sustainably when we use it no faster than it renews. Today humanity uses about 1.7 Earths' worth of resources a year, and this use is very unequal. Stewardship, careful planning and spatial tools like GIS help us move towards sustainability.
Nutrition – Nutrition is how we get and use the substances in food. The body needs six groups of nutrients: carbohydrates and fats (mainly energy), proteins (growth and repair), vitamins and minerals (small amounts to keep the body working), and water, plus fibre for healthy digestion. Carbohydrate and protein give about 17 kJ per gram, fat about 37 kJ per gram. A balanced diet gives all nutrients in the right amounts, and energy in should roughly equal energy out.
Food Safety and Hygiene – Food can carry tiny living things (bacteria, viruses, moulds) that make us ill. Four habits keep food safe: clean (hands, tools, surfaces), separate (raw away from ready-to-eat), cook (to at least 75 °C in the centre) and chill (keep cold food at 5 °C or below). Bacteria multiply fastest in the danger zone, 5–60 °C, and can double every 20 minutes. Food businesses use a hazard-control plan (HACCP) and cleaning routines to keep food safe.
Clothing: Why We Wear It, What It Is Made Of and How to Choose It – Clothes protect us from sun, rain and cold, give modesty, show identity (uniforms, traditional dress such as the sari or hanbok) and let us express ourselves. They are made of fibres: natural ones from plants (cotton, linen) and animals (wool, silk), and synthetic ones from petroleum (polyester, nylon). Fibres are spun into yarn and made into fabric by weaving (over-under) or knitting (loops). Design uses line, colour, shape and texture. A smart buyer plans a wardrobe, checks fit, quality and the care label, compares shops, works out cost per wear, and chooses sustainable options: buy less, mend, swap and recycle.
Housing: How Homes Meet Our Needs and Change Over Time – Housing is the place where people live. A good home gives shelter, safety, privacy, health and a sense of belonging. Houses are shaped by climate, local materials, culture, money and the way families live. Inside, living space is arranged into private, shared and service zones. A healthy home has fresh air, daylight, low damp and is kept clean and organised. Housing changes as society changes: from traditional houses such as courtyard homes to city apartments and future green, smart and shared homes. Fair access to decent, affordable housing is an important social issue.
Consumer Education: How to Be a Smart Buyer – A consumer is anyone who buys or uses goods and services. Smart buying starts with sorting needs (must have) from wants (nice to have). Rational consumption compares benefit with cost, counts the opportunity cost (what else the money could buy) and stays inside a budget. Sellers use psychology: anchor prices (a big crossed-out price), bandwagon ('everyone has it'), rush (countdowns), 99-endings and celebrity ads; teens are a key target online. Clicking 'I agree' makes a contract, so read terms, auto-renewal, cancel and refund rules. Read labels: price per unit, expiry, ingredients, allergens, nutrition and safety marks. Consumers have rights (safety, information, choice, to be heard, redress, education, basic needs, clean environment) and duties (keep bills, check marks, complain properly, buy sustainably). Together, consumers shape culture: what we buy decides what gets made.
Digital Footprints and Netiquette – A digital footprint is the trail of data we leave online. Active footprints are shared on purpose (posts, comments, forms); passive footprints are collected without us noticing (cookies, browsing history, location, IP address). Footprints are hard to erase and can be seen by others later. We live in a digital society where learning, banking, shopping and government services are online; a responsible user of it is a digital citizen (netizen). Net etiquette means being ethical (respect copyright, share reliable information), respectful (privacy, diversity, no bullying) and responsible (avoid oversharing, don't feed trolls). Communication etiquette asks us to be precise, polite and credible; social media etiquette asks us to choose passwords and privacy settings wisely, think before uploading, and verify before sharing.

3. Technological problem-solving and innovation

What technology is and its social effects · Standards and appropriate technology · Technological problem-solving process · Visualising solutions and drawings · Invention process · Intellectual property · Materials and their properties · Technical drawing conventions · Making products with tools · Eco-friendly energy resources · Solving energy problems · Transport and logistics systems · Solving transport problems

Science, Technology and Society: How Discoveries Change Our Lives – Science finds out how nature works; technology uses that knowledge to make tools and solve problems. Society shapes science too, by asking questions, paying for research and making rules. Big changes such as the printing press, the steam engine, electricity, vaccines and the internet changed how people work, live and think. Every technology has benefits and risks. To decide wisely we look at evidence, weigh benefits against risks, ask who gains and who loses, think about ethics and the future, and use safety rules.
Appropriate Technology – Appropriate technology is a tool or method that fits the people, place and money it is used for. It is usually simple, affordable, easy to repair locally and kind to the environment. The best technology is not always the newest or biggest. We choose by checking cost, skills, repair, energy, environment and how much is needed.
The Design Process: From Problem to Product – The design process is a loop of steps designers use to solve a real problem for real people: investigate the need, define it in a brief and a measurable specification, generate many ideas, build a prototype, then test and evaluate it against the specification. Whatever fails sends you back round the loop. This repeating is called iteration, and it is how almost every product, app, building and artwork is improved.
Technical Drawing: Communicating Design Ideas – Technical drawing is a shared visual language for showing the exact shape and size of an object. Designers start with freehand sketches, then use pictorial views (isometric, oblique) to show the object in 3D, and orthographic projection (front, top and side views) with standard lines, dimensions in millimetres and a scale so that anyone can make it. Today most drawings are made with CAD software.
Data Protection and Intellectual Property Rights – Intellectual property (IP) is a creation of the mind, such as a story, song, program, invention or logo. Intellectual Property Rights (IPR) give the creator control over its use. Copyright protects creative works (text, music, art, software code) automatically once created; a patent protects a new, useful invention for about 20 years and must be applied for; a trademark protects brand names, logos and slogans. Plagiarism is presenting someone else's work as your own without credit. Infringement is using protected IP without permission (copyright, patent or trademark infringement). Public licences let creators share on their own terms: Creative Commons (BY, SA, NC, ND) for creative works, and software licences such as GPL (copyleft: modified versions must stay open) and Apache (permissive: can be used in closed products with notices).
Materials and Their Properties – Everything we make is built from materials: wood, metals, plastics, glass, ceramics, fabrics and composites. Each has properties such as strength, stiffness, hardness, flexibility, density, heat and electrical conduction, transparency, water resistance and cost. Designers choose a material whose properties fit the job, think about how it will be shaped and joined (screws, nails, glue, welding, soldering, stitching), and consider safety, cost and the environment. Clothes are made from natural fibres (cotton, wool, silk) and synthetic fibres (polyester, nylon), each with its own feel and use.
Making Things: From Idea to Prototype – To make a product, we plan it, choose materials, measure and mark, cut, join, finish, test and then improve. The first working model is called a prototype. Each step uses the right tool, used safely. Testing shows what must change, and a good maker repeats the loop until the product works well.
Renewable Energy Sources – Non-renewable sources (coal, oil, gas, uranium) are used faster than nature makes them, and fossil fuels release CO₂. Renewable sources are refilled by nature: solar (photovoltaic cells and solar heating), wind (P ∝ v³), hydroelectric (P = η ρ g h Q), tidal, geothermal and biomass. Hydrogen fuel cells turn hydrogen and oxygen into electricity and water. Because sun and wind change, we need storage (batteries, pumped hydro) and a mix of sources. Every source has costs: land, materials, cost and effect on nature.
Transport Technology: Moving People and Goods – Transport technology moves people and goods from place to place. Every transport system has five parts: a vehicle, a way (road, rail, sea lane, air route), terminals (stations, ports, airports), a power source and a control system. Land vehicles push on the ground using friction. Ships float because water pushes up (buoyancy). Planes fly when lift beats weight and thrust beats drag. Rockets push gas backwards and are pushed forwards. Engines turn fuel or electricity into motion; electric motors waste less energy. Safety depends on stopping distance = thinking distance + braking distance. Future transport aims to be cleaner, safer and smarter: electric and hydrogen vehicles, maglev trains, drones and self-driving cars.

4. Sustainable technology and convergence

Construction technology and structures · Planning to maintaining structures · Sustainable building design · Electrical and electronic parts · ICT and AI applications · Solving ICT and AI problems · Machine elements and power transmission · Building a mechanism · Robots, control and automation · Medical technology · Biotechnology problems · Challenging attitude to technology · Empathetic problem solving

Construction Technology: How Buildings Are Planned and Built – Construction technology is the knowledge of how to plan, build, finish and look after structures. A building has a foundation, a frame (columns and beams), walls and a roof. Every load (dead load of the building itself, live load of people and furniture, wind and snow) must travel down a clear load path to the soil. Concrete is strong in compression, steel in tension, so reinforced concrete uses both. Builders work from scale drawings (plan, elevation, section), use maths to find areas and volumes, follow building codes for safety, and fit systems for water, power and air.
Sustainability – Sustainability means meeting our needs today without taking away the ability of future people to meet theirs. It rests on three pillars — environment, society and economy. A resource is used sustainably when we use it no faster than it renews. Today humanity uses about 1.7 Earths' worth of resources a year, and this use is very unequal. Stewardship, careful planning and spatial tools like GIS help us move towards sustainability.
Basic Electronics: Components and Circuits – Electronics uses small components to control electric current. A battery or power supply gives energy; a switch opens or closes the path. A resistor limits current (V = IR), a capacitor stores charge and can smooth or delay a signal, a diode lets current flow only one way, an LED is a diode that gives light, and a transistor uses a small base current to switch or amplify a much bigger current. Each part has a standard circuit symbol. Circuits are planned on paper or in a simulator, tried on a breadboard, and made permanent by soldering on a circuit board, using the right materials and safety steps. Analogue circuits handle smoothly changing signals; digital circuits handle on/off signals.
Artificial Intelligence: How Machines Learn to Think – Artificial intelligence (AI) is the skill of a computer system to do tasks that normally need human thinking: seeing, understanding speech, deciding and learning. An AI system is an agent that senses, thinks and acts. Old AI followed rules written by people. Modern AI mostly uses machine learning: it finds its own rule from many labelled examples (data). Neural networks are layers of simple units whose link strengths (weights) change during training. AI is used in maps, translation, health, farming and games. It can be wrong or unfair when its data is one-sided (bias), so people must check it, protect privacy and stay responsible.
Mechanisms: How Machines Change Motion and Force – A mechanism takes an input motion and force and gives a different output motion and force. There are four kinds of motion: rotary, linear, reciprocating and oscillating. Levers turn on a fulcrum; mechanical advantage (MA) = load ÷ effort. Gears and pulleys pass on turning motion; gear ratio = driven teeth ÷ driver teeth, and output speed = input speed ÷ gear ratio. Meshing gears turn opposite ways; a belt keeps the same direction. Cams, cranks and sliders, and rack and pinion change rotary motion into linear or reciprocating motion. Mechanisms trade speed for force: you never get more work out than you put in.
Robotics: How Robots Sense, Think and Act – A robot is a machine that senses the world, decides what to do with a program, and acts with motors. It has a body (structure), sensors, a controller, actuators, a transmission such as gears, and a power supply. Robots help in factories, hospitals, farms, homes and space.
The Design Process: From Problem to Product – The design process is a loop of steps designers use to solve a real problem for real people: investigate the need, define it in a brief and a measurable specification, generate many ideas, build a prototype, then test and evaluate it against the specification. Whatever fails sends you back round the loop. This repeating is called iteration, and it is how almost every product, app, building and artwork is improved.