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Teaching Elements and Principles of Bridge Design - International ...

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FEATURE ARTICLE<br />

use mathematics to place designs<br />

<strong>and</strong> potential solutions in perspective<br />

is paramount for a tech ed teaching<br />

career. Our globally competitive<br />

world runs on mathematics as it does<br />

on fuel. Tech ed teachers, regardless<br />

<strong>of</strong> the grade levels at which they will<br />

ultimately be teaching, should be able<br />

to appreciate the value <strong>of</strong><br />

mathematics <strong>and</strong> articulate its<br />

importance in classroom activities<br />

<strong>and</strong> design challenges. They should<br />

be comfortable manipulating<br />

mathematics symbols, able to draw<br />

conclusions from its application, <strong>and</strong><br />

trusting <strong>of</strong> the directions it indicates<br />

in their designs. It should become<br />

second nature to tech ed teachers to<br />

reach out for the mathematics tool.<br />

A Physical Feel <strong>of</strong> the World<br />

Computers are simply knowledge<br />

amplifiers, devoid <strong>of</strong> any creativity or<br />

insight save that imbued them by<br />

their programmers. A good tech ed<br />

teacher has sufficient grounding in<br />

first principles to be able to have an<br />

intuitive feel for the “rightness” <strong>of</strong><br />

solutions, whether computer-derived<br />

or otherwise. This comes with<br />

frequent exposure to problem-solving<br />

regimens, confidence honed through<br />

success <strong>and</strong> constructive criticism,<br />

<strong>and</strong> a frank analysis <strong>of</strong> design failure.<br />

Computers are tools, not arbiters <strong>of</strong><br />

“rightness”—<strong>and</strong> they most certainly<br />

should not be the image that springs<br />

to mind when someone says the<br />

word “technology.” Their output is to<br />

be as critically reviewed <strong>and</strong> weighed<br />

as any other data/information.<br />

As a minimum, would-be tech ed<br />

teachers should be able to explain<br />

<strong>and</strong> demonstrate with mathematics:<br />

• Simple machines <strong>and</strong> their<br />

ubiquitous presence in real life.<br />

• The force over distance action.<br />

• Hydraulics (Pascal’s principle).<br />

• How transformers work.<br />

• AC versus DC current.<br />

• The difference between power <strong>and</strong><br />

energy.<br />

• Simple airplane flight, <strong>and</strong> fluid<br />

flow (Bernoulli’s principle).<br />

Brain-Based Research<br />

In light <strong>of</strong> the remarkable findings in<br />

the area <strong>of</strong> brain-based research, the<br />

tech ed teacher <strong>of</strong> tomorrow should<br />

be knowledgeable <strong>and</strong> versed in the<br />

classroom implications <strong>of</strong> this work,<br />

specifically the ability to:<br />

• Apply head <strong>and</strong> h<strong>and</strong>s learning<br />

paradigms as needed.<br />

• Assemble balanced classroom<br />

student teams for design<br />

challenges.<br />

• Teach in a Socratic style,<br />

coalescing answers to classroom<br />

challenges.<br />

• Conduct open-ended, team-based<br />

exercises.<br />

• Teach solution methods to multidimensional<br />

problems in a multidisciplinary<br />

manner.<br />

Technology <strong>and</strong> Our National<br />

Culture <strong>and</strong> History:<br />

Underst<strong>and</strong>ing Our Nation’s<br />

Technological History<br />

We did not attain the status <strong>of</strong> most<br />

technological nation on the planet by<br />

accident. There is a rich history with<br />

definite phases <strong>of</strong> key technologies<br />

that mark <strong>and</strong> define the growth <strong>and</strong><br />

transformation <strong>of</strong> our society, from<br />

revolutionary times to the present.<br />

They are:<br />

1800-1850: Canals, steam power,<br />

textile manufacturing.<br />

1850-1900: Railroads, steel, the<br />

emergence <strong>of</strong> natural gas, water,<br />

telephone, sewage, <strong>and</strong> electric<br />

utilities.<br />

1900-1950: Electric power,<br />

automobiles, hydropower, chemicals,<br />

mass media, communications, <strong>and</strong><br />

R&D labs.<br />

1950-2000: Computers, electronics,<br />

aerospace, pharmaceuticals, nuclear<br />

power, a national highway system,<br />

TV <strong>and</strong> biotechnology.<br />

A tech ed teacher should have a good<br />

grasp <strong>of</strong> what those defining phases<br />

were <strong>and</strong> how they influenced our<br />

society.<br />

The Technology-History-Economy<br />

Triad<br />

Because we live in a free market<br />

economy <strong>and</strong> expect pr<strong>of</strong>it for our<br />

hard work <strong>and</strong> ingenuity, this has<br />

made all the difference in both our<br />

technological creativity <strong>and</strong> optimism<br />

for the future. Our technology,<br />

history, <strong>and</strong> economy are inextricably<br />

intertwined. Any attempt to separate<br />

them will detrimentally alter our<br />

world-recognized penchant for<br />

ingenuity <strong>and</strong> out-<strong>of</strong>-the-box thinking.<br />

Capitalism <strong>and</strong> its ability to influence<br />

creativity, markets, <strong>and</strong><br />

entrepreneurship was built into our<br />

national Constitution from the very<br />

beginning—the very fuel a fledgling<br />

new nation would need to tame its<br />

frontiers. Over 60% <strong>of</strong> the annual<br />

growth in our nation’s economy is<br />

directly attributable to scientific <strong>and</strong><br />

technological advances. It is the very<br />

essence <strong>of</strong> our high st<strong>and</strong>ard <strong>of</strong><br />

living. To effectively discuss the<br />

benefits <strong>of</strong> technology, a tech ed<br />

teacher must recognize the<br />

importance <strong>of</strong> the technology-historyeconomy<br />

triad.<br />

The Value <strong>of</strong> Infrastructure<br />

Every day, vital services are delivered<br />

to our homes, making it unnecessary<br />

for us to arrange for the availability <strong>of</strong><br />

these resources or expend personal<br />

time <strong>and</strong> energy to gather or attain<br />

them. I am speaking <strong>of</strong> the<br />

infrastructure/services such as water,<br />

electricity, telephone, natural gas,<br />

sewerage, cable, <strong>and</strong> satellite TV. In<br />

the last few years, there have been<br />

major changes to the telephone <strong>and</strong><br />

electricity infrastructure (cell phones,<br />

home PC use, deregulation <strong>of</strong><br />

electricity, distributed generation<br />

sources, etc.). New technological<br />

advances have totally re-shaped<br />

these infrastructures. What a fertile<br />

area for study <strong>and</strong> what it portends<br />

for the future! Students <strong>of</strong>ten take<br />

these infrastructures for granted, <strong>and</strong><br />

should be studying the origin, history,<br />

use, <strong>and</strong> growth <strong>of</strong> these essential<br />

community-based services.<br />

Competent tech ed teachers should<br />

be able to bring the value <strong>of</strong> these<br />

services to their classrooms <strong>and</strong><br />

arrange for students to creatively<br />

explore <strong>and</strong> underst<strong>and</strong> them.<br />

Technology, Ecology, <strong>and</strong> Man<br />

The internalization <strong>of</strong> environmental<br />

costs <strong>and</strong> impacts on the way<br />

business is conducted has been a<br />

significant achievement over the last<br />

40 years. All major projects are<br />

required to divulge the potential<br />

environmental impacts <strong>of</strong> their<br />

THE TECHNOLOGY TEACHER • April 2005 37

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