There is a fact that not a few troubles of marine engines and instruments are caused by inadequate maintenance of lubricating oils, and under some occasions, they develop to big emergencies.
By the way, there is a tendency that many marine engineers sometimes lack in sufficient technical knowledges and informations about lubricating oil maintenances.
Lubricating oil maintenance is one of the most important subjects to keep marine engines and instruments in good conditions. In order to minimize the troubles caused by inadequate maintenance of lubricating oils, systematic scheduling of marine lubricating oil maintenance has been studied by using personal computer, and they are actually applied.

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To find the countermeasure to decrease the ship's crew, analysis of the ship's work for existing vessel is carried out. As the result, following countermeasure is required.
Control room is so arranged that main and auxiliary machines can be operated from wheel house, and auxiliary machines for cargo handling and port use can be operated from control room combined with ballast control. Automatic control and remote control is applied more than existing one. Less maintenance and easy maintenance is considered. Maintenance work in port is shifted to shore service.
The vessel designed according to above-mentioned countermeasure is operated by 18 crews, and expected to decrease crews 16 or less.

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It can be said that the technology of voice synthesis and voice recognition in land use has now entered its first stage of practical use.
As an experimental trial aiming at man-power saving, the voice control systems, capable of recognizing the registered voices of different speakers, are being developed for main engine and mooring winches.
In this report, outlines of the voice control systems are introduced.

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Under the situation of deteriorating quality of residual fuel oil, purification systems are now required to provide many specifications and functions on modernized ships. The following papers introduce the developed systems by each purifier makers.

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