Most models of production planning based on mathematical programming tend to assume constant technical coefficients. This assumption is realistic when the production is based on machines as it is the case in manufacturing. On the other hand, production planning in the service sector involves...

Regulations around the world are forbidding incandescence bulbs in an attempt to curb electricity consumption. However, lighting occupies a very small share in the total electricity consumption. The replacement technology, mostly fluorescent bulbs count among drawbacks a negative impact on human...

Environmental preservation, economic growth and related topics that have an impact on Earth are becoming more and more important today. Worldwide, there's a call for a deep involvement in favour of sustainable development. Pursuing sustainable development objectives needs day-by-day commitment...