Efficient energy consumption in homes is one of key elements of sustainable healthy residential living. This thesis deals with decision-making method and procedure for home energy use scheduling designed to boost energy efficiency. Home energy use scheduling is a complex task that combines various data for decision-making. To carry out the task, this study used the idea of utilizing 'life log data,' which is recording and storing daily routines. Life log data is recorded and stored in a metrics developed through a literature study and it contains 5W1H data (Who, When, Where, What, Why, How). Through the 5W1H data, lifestyle of residents can be analysed to determine the right services for them. The processes are as follows; House environments, Service determined, Similarity analysis, Data filtering, Smart service. As the life log data is developed by human's experience, this system makes it possible for one to one personalized service. And it can be possible personal energy savings at home. One of the key merits in relation to the utilization of the life-log data is that it can provide a customized one-on-one service reflecting the behavioural patterns and the lifestyles of a resident.

In Korea, the current water resources will fall short by 2.6 billion tons to meet the 38 billion ton water demand in the year 2020. To overcome the future water shortage, it is desirable to minimize water consumption and to reuse treated wastewater. There are a total of 99 on-site water-recycling systems in the country. The potential capacity of the 99 systems is 429 thousands tons/day, which is 3.6% of the total service water. Compared to other industrialized countries, the number of the water recycling systems in Korea is extremely small. This is mainly due to the following reasons. First, in Korea, any building with more than 60,000 m2 of total floor space is required to install a water reuse system by law. However, only less than 0.5% of the total buildings have more than 10,000 m2. Therefore, the regulation is ineffective and merely nominal. Second, service water is supplied at low charge (0.20 US-dollar/m3 water). The inexpensive service water often discourages people to recycle treated wastewater. Third, people still think recycled water is not clean enough and can cause diseases. Therefore, they should be informed that a well-maintained recycling system does not fail to produce water with high quality.

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