Kepulauan Seribu or The Seribu Islands, Indonesia, also known in English as the Thousand Islands, consisting of 106 islands, is located to the north of Jakarta, the capital city of Indonesia....

Wire communications are expensive to establish restrict end user to one particular locale. On the other hand, wireless communications allow people connecting quickly and conveniently, but insecure for communication....

Passive solar heating is defined as using solar energy incident on windows, skylights, greenhouses, clerestories, mass walls, and thermosyphoning collectors in order to provide heating for a house. Generally such solar collection occurs passively, without the extensive use of pumps or fans typically used in active solar collector systems....